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100 DS8000 Series: Concepts and Architecture
Figure 5-13 Optimal placement of data
5.4 Benefits of virtualization
The DS8000 physical and logical architecture defines new standards for enterprise storage
virtualization. The main benefits of the virtualization layers are:
Flexible LSS definition allows maximization/optimization of the number of devices per
LSS.
No strict relationship between RAID ranks and LSSs.
No connection of LSS performance to underlying storage.
Number of LSSs can be defined based upon device number requirements:
– With larger devices significantly fewer LSSs might be used.
– Volumes for a particular application can be kept in a single LSS.
– Smaller LSSs can be defined if required (for systems/applications requiring less
storage).
– Test systems can have their own LSSs with fewer volumes than production systems.
Increased number of logical volumes:
– Up to 65280 (CKD)
– Up to 65280 (FB)
– 65280 total for CKD + FB
Server0
Server1
Extent Pool FB-0c
Extent Pool FB-1a
Extent Pool FB-0a
Extent Pool FB-1c
DA pair 1
DA pair 1
DA pair 2
DA pair 2
Host LVM volume
Extent Pool FB-1bExtent Pool FB-0b
Extent Pool FB-0d Extent Pool FB-1d
Loop 1
Loop 2
Loop 2
Loop 1
LSS 00 LSS 01